The M119 gas engine doesn't have a ratchet style tensioner, & yes they can jump & cause problems just like M116/117. The inner rail seams to break on this engine.
Most diesels dont need rails on normal chain replacement.
Benz issued a S.I. on all diesels from 7/92 thru 7/94 on possible chain failure. The only other engine they issued a bulletin on is the 1984-88 190E 2.3 8V, timing chain inspection every 60K miles is recommended.
MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. TECH
190E 2.3 ITS RACECAR
1986 190E 16V